Hanging of the gripping-jaws of spike-machines in weighted levers



J. H. SWETT. HANGING THE GRIPPING JAWS 0F SPIKE MACHINES.

No. 10,645. Patented Mar. 14, 185.4.

JAMES H. SWETT, OF PITTSBURGH, PENNSYLVANIA.

HANGING OF THE GRIPPING J'AWS 0F SPIKE-MACHINES IN WEIGHTED LEVERS.

Specification of Letters Patent No. 10,645, dated March 14, 1854.

To all whom it may 00ncern:

Be it known that I, JAMES H. SwETT, of Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful improvements in the method of hanging the gripping-jaws ofspike-machines to prevent the breaking up of the machine when two spikesor a spike and blank accidentally get into or between the dies at thesame time; and I do hereby declare thefollowing to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, in which- Figure 1 represents a side view. Fig. 2 represents aview from the front; and Fig. 3 represents a rear view, of so much of aspike machine as is necessary to show the invention.

Similar letters in the several figures clenote like parts.

To enable others skilled in the art to make and use my invention, thenature of which relates to the hanging of the gripping jaw in weightedlevers or their equivalents so that when any larger amount of metal thanthe spike which the machine is set for making gets into the dies, saidgripping jaw will riseand yield to the metal, I will proceed to describethe same with reference to the drawings.

WVith the best delivering apparatus known, a spike and blank willsometimesget between the dies at the same time. This may happen but oncea day or once a week, but it invariably breaks up the machine when itdoes happen. To avoid this evil I hang the gripping jaw in weightedlevers which allow it to use when it is exerting greater pressure thanit is for the time beingset for.

A represents a part of the frame of the machine; B, the gripping jaw,with its trunnions or journals C, supported in suitable hearings inlevers D, on each side of it. 7 The fulcra of the levers D, is at E, andthe fulcrum of the gripping jaw at C. The rears of the levers areprovided with a weight F, resting on them, which may however ifpreferred be suspended from them so as to hang below the frame; orinst-cad of weights, springs heavily made may be used, the object beingto prevent the gripping jaw from I ure of the delivery apparatus tothrow out the finished spike, before the blank'comes into the dies,which with the great rapidity of the working of the machine will happenoccasionally. It might be possible to load the grippingjaw itself, so asto give itthis yieldlng property, but in that case a dead weight must becarried and operated constantly, when its advantages would only becalled into action probably once a week. .With the weighted levers,which never move unless the gripping jawis overstrained, no such deadweight is carried. India rubber should I be placed under the leverswhere they touch the frame, so that when they come down after they haveallowed the gripping jaw to yield, they may not strike with suchviolence as toendanger the machine.

G, is the wrist pin to which the power for moving the gripping jaw maybe applied; H, the cam on its shaft working underneath the rear of thegripping jaw.

a represents the die, and b the set screw for adjusting it; the otherhalf of the die is formed in-the anvil block I.

The heading apparatus is not shown, a any well known heading machinerycan be applied, and my invention only relates to the gripping jaws. V

The trunnions or journals C, it will be, readily understood, must havesome play in the frame, so as to enable the gripping jaw to rise whenoverstrained as above described.

tially as herein described.

JAMES H. swETT. Witnesses l SA L. G'RUBB,

A. B. S'roUeHToN.

